Hello,
Please let me explain my issue;
I am going to move databases from host1 to host2, with same OS version, same oracle db version etc .. but with more RAM, CPU ...
I am going to keep ASM disks and present the same LUNs to host2.
I need to install first grid infrastructure ASM / Oracle database software 11.2.0.3 first.How can I install ASM grid infrastructure without specifying ASM Diskgroups during installation steps?
I will need then to just specify asm_diskstring / asm_diskgroup and let ASM discover the existing disks.I believe I need to specify an ASM diskgroup for ASM spfile. How to resolve this issue?!

Hello,
Please let me explain my issue;
I am going to move databases from host1 to host2, with same OS version, same oracle db version etc .. but with more RAM, CPU ...
I am going to keep ASM disks and present the same LUNs to host2.
I need to install first grid infrastructure ASM / Oracle database software 11.2.0.3 first.How can I install ASM grid infrastructure without specifying ASM Diskgroups during installation steps?
I will need then to just specify asm_diskstring / asm_diskgroup and let ASM discover the existing disks. right?I believe I need to specify an ASM diskgroup for ASM spfile. How to resolve this issue?!

It is looks very good.
You can create ASM instance with ASMCA, too.
After that you can scan asm disk groups.
Then you can create a database service same name and start database with parameter file with content SPFILE=+DATA\PARAMETERTERFILE\SPFILE.ORA

ASMCA will enable/configure "ora.asm" (by adding SPFILE and some PARAMETERS on OLR) resources and all resources dependent and will create DISKGROUP resources.
If you don't config it, ASM will not be started/stoped/restarted automatically.

So again.. Is recommended create a ASM Instance using ASMCA and using a SMALL Lun (1GB) to store only SPFILE of ASM during creation and after just mount the others DISKGROUP.

When you will enable your database or add on Oracle Restart, the resources DISKGROUP and ASM must exists to work properly
Edited by: Levi Pereira on Apr 11, 2013 1:31 PM